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/* Test ancillary data header creation.
Copyright (C) 2022-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* We use the preprocessor to generate the function/macro tests instead of
using indirection because having all the macro expansions alongside
each other lets the compiler warn us about suspicious pointer
arithmetic across subsequent CMSG_{FIRST,NXT}HDR expansions. */
#include <stdint.h>
#define RUN_TEST_CONCAT(suffix) run_test_##suffix
#define RUN_TEST_FUNCNAME(suffix) RUN_TEST_CONCAT (suffix)
static void
RUN_TEST_FUNCNAME (CMSG_NXTHDR_IMPL) (void)
{
struct msghdr m = {0};
struct cmsghdr *cmsg;
char cmsgbuf[3 * CMSG_SPACE (sizeof (PAYLOAD))] = {0};
m.msg_control = cmsgbuf;
m.msg_controllen = sizeof (cmsgbuf);
/* First header should point to the start of the buffer. */
cmsg = CMSG_FIRSTHDR (&m);
TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
/* If the first header length consumes the entire buffer, there is no
space remaining for additional headers. */
cmsg->cmsg_len = sizeof (cmsgbuf);
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg == NULL);
/* The first header length is so big, using it would cause an overflow. */
cmsg = CMSG_FIRSTHDR (&m);
TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
cmsg->cmsg_len = (__typeof (cmsg->cmsg_len)) SIZE_MAX;
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg == NULL);
/* The first header leaves just enough space to hold another header. */
cmsg = CMSG_FIRSTHDR (&m);
TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
cmsg->cmsg_len = sizeof (cmsgbuf) - sizeof (struct cmsghdr);
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg != NULL);
/* The first header leaves space but not enough for another header. */
cmsg = CMSG_FIRSTHDR (&m);
TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
cmsg->cmsg_len ++;
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg == NULL);
/* The second header leaves just enough space to hold another header. */
cmsg = CMSG_FIRSTHDR (&m);
TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
cmsg->cmsg_len = CMSG_LEN (sizeof (PAYLOAD));
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg != NULL);
cmsg->cmsg_len = sizeof (cmsgbuf)
- CMSG_SPACE (sizeof (PAYLOAD)) /* First header. */
- sizeof (struct cmsghdr);
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg != NULL);
/* The second header leaves space but not enough for another header. */
cmsg = CMSG_FIRSTHDR (&m);
TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg != NULL);
cmsg->cmsg_len ++;
cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
TEST_VERIFY_EXIT (cmsg == NULL);
return;
}
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